UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

(Rule 13d-101)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT

TO § 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO

§ 240.13d-2(a)

(Amendment No. 5)1

CTI BioPharma Corp.

(Name of Issuer)

Common Stock, $0.001 par value

(Title of Class of Securities)

12648L601

(CUSIP Number)

JAMES KRATKY

BVF PARTNERS L.P.

44 Montgomery St., 40th Floor

San Francisco, California 94104

(415) 525-8890

 

ADAM W. FINERMAN, ESQ.

OLSHAN FROME WOLOSKY LLP

1325 Avenue of the Americas

New York, New York 10019

(212) 451-2300

(Name, Address and Telephone Number of Person

Authorized to Receive Notices and Communications)

 

January 31, 2020

(Date of Event Which Requires Filing of This Statement)

 

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box x.

Note:  Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits.  See § 240.13d-7 for other parties to whom copies are to be sent. 

 

1              The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

 

CUSIP No. 12648L601

  1   NAME OF REPORTING PERSON  
         
        BIOTECHNOLOGY VALUE FUND, L.P.  
  2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☒
        (b) ☐
           
  3   SEC USE ONLY    
           
           
  4   SOURCE OF FUNDS  
         
        WC  
  5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)     ☐
       
           
  6   CITIZENSHIP OR PLACE OF ORGANIZATION  
         
        DELAWARE  
NUMBER OF   7   SOLE VOTING POWER  
SHARES          
BENEFICIALLY         - 0 -  
OWNED BY   8   SHARED VOTING POWER  
EACH          
REPORTING         6,795,120(1)  
PERSON WITH   9   SOLE DISPOSITIVE POWER  
         
          - 0 -  
    10   SHARED DISPOSITIVE POWER  
           
          6,795,120(1)  
  11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON  
         
        6,795,120(1)  
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES     ☐
       
           
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)  
         
        11.0%(1)  
  14   TYPE OF REPORTING PERSON  
         
        PN  

(1) Includes 3,754,000 shares of Common Stock underlying 5,631 shares of Series O Preferred Stock convertible within 60 days hereof, subject to the Beneficial Ownership Limitation (as defined below).

  

2

CUSIP No. 12648L601

  1   NAME OF REPORTING PERSON  
         
        BVF I GP LLC  
  2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☒
        (b) ☐
           
  3   SEC USE ONLY    
           
           
  4   SOURCE OF FUNDS  
         
        AF  
  5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)     ☐
       
           
  6   CITIZENSHIP OR PLACE OF ORGANIZATION  
         
        DELAWARE  
NUMBER OF   7   SOLE VOTING POWER  
SHARES          
BENEFICIALLY         - 0 -  
OWNED BY   8   SHARED VOTING POWER  
EACH          
REPORTING         6,795,120(1)  
PERSON WITH   9   SOLE DISPOSITIVE POWER  
         
          - 0 -  
    10   SHARED DISPOSITIVE POWER  
           
          6,795,120(1)  
  11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON  
         
        6,795,120(1)  
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES     ☐
       
           
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)  
         
        11.0%(1)  
  14   TYPE OF REPORTING PERSON  
         
        OO  

(1) Includes 3,754,000 shares of Common Stock underlying 5,631 shares of Series O Preferred Stock convertible within 60 days hereof, subject to the Beneficial Ownership Limitation (as defined below).

  

3

CUSIP No. 12648L601

 

  1   NAME OF REPORTING PERSON  
         
        BIOTECHNOLOGY VALUE FUND II, L.P.  
  2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☒
        (b) ☐
           
  3   SEC USE ONLY    
           
           
  4   SOURCE OF FUNDS  
         
        WC  
  5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)     ☐
       
           
  6   CITIZENSHIP OR PLACE OF ORGANIZATION  
         
        DELAWARE  
NUMBER OF   7   SOLE VOTING POWER  
SHARES          
BENEFICIALLY         - 0 -  
OWNED BY   8   SHARED VOTING POWER  
EACH          
REPORTING         4,179,280(1)  
PERSON WITH   9   SOLE DISPOSITIVE POWER  
         
          - 0 -  
    10   SHARED DISPOSITIVE POWER  
           
          4,179,280(1)  
  11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON  
         
        4,179,280(1)  
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES     ☐
       
           
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)  
         
        7.0%(1)  
  14   TYPE OF REPORTING PERSON  
         
        PN  

(1) Includes 2,070,000 shares of Common Stock underlying 3,105 shares of Series O Preferred Stock convertible within 60 days hereof. Excludes 356,667 shares of Common Stock underlying 535 shares of Series O Preferred Stock, which may not be converted due to the Beneficial Ownership Limitation (as defined below).

  

4

CUSIP No. 12648L601

 

  1   NAME OF REPORTING PERSON  
         
        BVF II GP LLC  
  2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☒
        (b) ☐
           
  3   SEC USE ONLY    
           
           
  4   SOURCE OF FUNDS  
         
        AF  
  5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)     ☐
       
           
  6   CITIZENSHIP OR PLACE OF ORGANIZATION  
         
        DELAWARE  
NUMBER OF   7   SOLE VOTING POWER  
SHARES          
BENEFICIALLY         - 0 -  
OWNED BY   8   SHARED VOTING POWER  
EACH          
REPORTING         4,179,280(1)  
PERSON WITH   9   SOLE DISPOSITIVE POWER  
         
          - 0 -  
    10   SHARED DISPOSITIVE POWER  
           
          4,179,280(1)  
  11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON  
         
        4,179,280(1)  
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES     ☐
       
           
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)  
         
        7.0%(1)  
  14   TYPE OF REPORTING PERSON  
         
        OO  

(1) Includes 2,070,000 shares of Common Stock underlying 3,105 shares of Series O Preferred Stock convertible within 60 days hereof. Excludes 356,667 shares of Common Stock underlying 535 shares of Series O Preferred Stock, which may not be converted due to the Beneficial Ownership Limitation (as defined below).

  

5

CUSIP No. 12648L601

 

  1   NAME OF REPORTING PERSON  
         
        BIOTECHNOLOGY VALUE TRADING FUND OS LP  
  2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☒
        (b) ☐
           
  3   SEC USE ONLY    
           
           
  4   SOURCE OF FUNDS  
         
        WC  
  5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)     ☐
       
           
  6   CITIZENSHIP OR PLACE OF ORGANIZATION  
         
        CAYMAN ISLANDS  
NUMBER OF   7   SOLE VOTING POWER  
SHARES          
BENEFICIALLY         - 0 -  
OWNED BY   8   SHARED VOTING POWER  
EACH          
REPORTING         483,708(1)  
PERSON WITH   9   SOLE DISPOSITIVE POWER  
         
          - 0 -  
    10   SHARED DISPOSITIVE POWER  
           
          483,708(1)  
  11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON  
         
        483,708(1)  
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES     ☐
       
           
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)  
         
        Less than 1%(1)  
  14   TYPE OF REPORTING PERSON  
         
        PN  

(1) Excludes 682,666 shares of Common Stock underlying 1,024 shares of Series O Preferred Stock, which may not be converted due to the Beneficial Ownership Limitation (as defined below).

  

6

CUSIP No. 12648L601

 

  1   NAME OF REPORTING PERSON  
         
        BVF PARTNERS OS LTD.  
  2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☒
        (b) ☐
           
  3   SEC USE ONLY    
           
           
  4   SOURCE OF FUNDS  
         
        AF  
  5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)     ☐
       
           
  6   CITIZENSHIP OR PLACE OF ORGANIZATION  
         
        CAYMAN ISLANDS  
NUMBER OF   7   SOLE VOTING POWER  
SHARES          
BENEFICIALLY         - 0 -  
OWNED BY   8   SHARED VOTING POWER  
EACH          
REPORTING         483,708(1)  
PERSON WITH   9   SOLE DISPOSITIVE POWER  
         
          - 0 -  
    10   SHARED DISPOSITIVE POWER  
           
          483,708(1)  
  11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON  
         
        483,708(1)  
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES     ☐
       
           
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)  
         
        Less than 1%(1)  
  14   TYPE OF REPORTING PERSON  
         
        CO  

(1) Excludes 682,666 shares of Common Stock underlying 1,024 shares of Series O Preferred Stock, which may not be converted due to the Beneficial Ownership Limitation (as defined below).

  

7

CUSIP No. 12648L601

 

  1   NAME OF REPORTING PERSON  
         
        BVF GP HOLDINGS LLC  
  2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☒
        (b) ☐
           
  3   SEC USE ONLY    
           
           
  4   SOURCE OF FUNDS  
         
        AF  
  5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)     ☐
       
           
  6   CITIZENSHIP OR PLACE OF ORGANIZATION  
         
        DELAWARE  
NUMBER OF   7   SOLE VOTING POWER  
SHARES          
BENEFICIALLY         - 0 -  
OWNED BY   8   SHARED VOTING POWER  
EACH          
REPORTING         10,974,400(1)  
PERSON WITH   9   SOLE DISPOSITIVE POWER  
         
          - 0 -  
    10   SHARED DISPOSITIVE POWER  
           
          10,974,400(1)  
  11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON  
         
        10,974,400(1)  
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES     ☐
       
           
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)  
         
        17.2%(1)  
  14   TYPE OF REPORTING PERSON  
         
        OO  

(1) Includes 5,824,000 shares of Common Stock underlying 8,736 shares of Series O Preferred Stock convertible within 60 days hereof. Excludes 356,667 shares of Common Stock underlying 535 shares of Series O Preferred Stock, which may not be converted due to the Beneficial Ownership Limitation (as defined below).

  

8

CUSIP No. 12648L601

 

  1   NAME OF REPORTING PERSON  
         
        BVF PARTNERS L.P.  
  2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☒
        (b) ☐
           
  3   SEC USE ONLY    
           
           
  4   SOURCE OF FUNDS  
         
        AF  
  5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)     ☐
       
           
  6   CITIZENSHIP OR PLACE OF ORGANIZATION  
         
        DELAWARE  
NUMBER OF   7   SOLE VOTING POWER  
SHARES          
BENEFICIALLY         - 0 -  
OWNED BY   8   SHARED VOTING POWER  
EACH          
REPORTING         12,753,690(1)  
PERSON WITH   9   SOLE DISPOSITIVE POWER  
         
          - 0 -  
    10   SHARED DISPOSITIVE POWER  
           
          12,753,690(1)  
  11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON  
         
        12,753,690(1)  
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES     ☐
       
           
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)  
         
        19.99%(1)  
  14   TYPE OF REPORTING PERSON  
         
        PN, IA  

(1) Includes 5,824,000 shares of Common Stock underlying 8,736 shares of Series O Preferred Stock convertible within 60 days hereof. Excludes 2,559,333 of Common Stock underlying 3,839 shares of Series O Preferred Stock, which may not be converted due to the Beneficial Ownership Limitation (as defined below).

  

9

CUSIP No. 12648L601

 

  1   NAME OF REPORTING PERSON  
         
        BVF INC.  
  2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☒
        (b) ☐
           
  3   SEC USE ONLY    
           
           
  4   SOURCE OF FUNDS  
         
        AF  
  5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)     ☐
       
           
  6   CITIZENSHIP OR PLACE OF ORGANIZATION  
         
        DELAWARE  
NUMBER OF   7   SOLE VOTING POWER  
SHARES          
BENEFICIALLY         - 0 -  
OWNED BY   8   SHARED VOTING POWER  
EACH          
REPORTING         12,753,690(1)  
PERSON WITH   9   SOLE DISPOSITIVE POWER  
         
          - 0 -  
    10   SHARED DISPOSITIVE POWER  
           
          12,753,690(1)  
  11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON  
         
        12,753,690(1)  
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES     ☐
       
           
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)  
         
        19.99%(1)  
  14   TYPE OF REPORTING PERSON  
         
        CO  

(1) Includes 5,824,000 shares of Common Stock underlying 8,736 shares of Series O Preferred Stock convertible within 60 days hereof. Excludes 2,559,333 of Common Stock underlying 3,839 shares of Series O Preferred Stock, which may not be converted due to the Beneficial Ownership Limitation (as defined below).

  

10

CUSIP No. 12648L601

 

  1   NAME OF REPORTING PERSON  
         
        MARK N. LAMPERT  
  2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☒
        (b) ☐
           
  3   SEC USE ONLY    
           
           
  4   SOURCE OF FUNDS  
         
        AF  
  5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)     ☐
       
           
  6   CITIZENSHIP OR PLACE OF ORGANIZATION  
         
        USA  
NUMBER OF   7   SOLE VOTING POWER  
SHARES          
BENEFICIALLY         - 0 -  
OWNED BY   8   SHARED VOTING POWER  
EACH          
REPORTING         12,753,690(1)  
PERSON WITH   9   SOLE DISPOSITIVE POWER  
         
          - 0 -  
    10   SHARED DISPOSITIVE POWER  
           
          12,753,690(1)  
  11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON  
         
        12,753,690(1)  
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES     ☐
       
           
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)  
         
        19.99%(1)  
  14   TYPE OF REPORTING PERSON  
         
        IN  

(1) Includes 5,824,000 shares of Common Stock underlying 8,736 shares of Series O Preferred Stock convertible within 60 days hereof. Excludes 2,559,333 of Common Stock underlying 3,839 shares of Series O Preferred Stock, which may not be converted due to the Beneficial Ownership Limitation (as defined below).

  

11

CUSIP No. 12648L601

 

  1   NAME OF REPORTING PERSON  
         
        MATTHEW D. PERRY  
  2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☒
        (b) ☐
           
  3   SEC USE ONLY    
           
           
  4   SOURCE OF FUNDS  
         
        OO  
  5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)     ☐
       
           
  6   CITIZENSHIP OR PLACE OF ORGANIZATION  
         
        USA  
NUMBER OF   7   SOLE VOTING POWER  
SHARES          
BENEFICIALLY         153,139(1)  
OWNED BY   8   SHARED VOTING POWER  
EACH          
REPORTING         - 0 -  
PERSON WITH   9   SOLE DISPOSITIVE POWER  
         
          153,139(1)  
    10   SHARED DISPOSITIVE POWER  
           
          - 0 -  
  11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON  
         
        153,139(1)  
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES     ☐
       
           
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)  
         
        Less than 1%(1)  
  14   TYPE OF REPORTING PERSON  
         
        IN  

(1) Includes 110,000 shares of Common Stock issuable on the exercise of certain options that are currently exercisable.  

12

CUSIP No. 12648L601

The following constitutes Amendment No. 5 to the Schedule 13D filed by the undersigned (“Amendment No. 5”). This Amendment No. 5 amends the Schedule 13D as specifically set forth herein.

Item 2. Identity and Background.

Item 2 is hereby amended and restated to read as follows:

(a)       This statement is filed by:

(i) Biotechnology Value Fund, L.P., a Delaware limited partnership (“BVF”);
(ii) BVF I GP LLC, a Delaware limited liability company (“BVF GP”), which serves as general partner of BVF;
(iii) Biotechnology Value Fund II, L.P., a Delaware limited partnership (“BVF2”);
(iv) BVF II GP LLC, a Delaware limited liability company (“BVF2 GP”), which serves as general partner of BVF2;
(v) Biotechnology Value Trading Fund OS LP, a Cayman Islands limited partnership (“Trading Fund OS”);
(vi) BVF Partners OS Ltd., a Cayman Islands limited liability company (“Partners OS”), which serves as general partner of Trading Fund OS;
(vii) BVF GP Holdings LLC, a Delaware limited liability company (“BVF GPH”), which is the sole member of each of BVF GP and BVF2 GP;
(viii) BVF Partners L.P., a Delaware limited partnership (“Partners”), which serves as the investment manager of each of BVF, BVF2, Trading Fund OS and certain managed accounts (the “Partners Managed Accounts”), and as the sole member of Partners OS;
(ix) BVF Inc., a Delaware corporation, which serves as the general partner of Partners and the managing member of BVF GPH;
(x) Mark N. Lampert, who serves as the sole officer and director of BVF Inc.; and
(xi) Matthew D. Perry, the President of Partners and member of the Issuer’s Board of Directors.

Each of the foregoing is referred to as a “Reporting Person” and collectively as the “Reporting Persons.” Each of the Reporting Persons is party to that certain Joint Filing Agreement, as further described in Item 6. Accordingly, the Reporting Persons are hereby filing a joint Schedule 13D.

13

CUSIP No. 12648L601

(b)       The business address of BVF, BVF GP, BVF2, BVF2 GP, BVF GPH, Partners, BVF Inc., Mr. Lampert and Mr. Perry is 44 Montgomery St., 40th Floor, San Francisco, California 94104. The business address of Trading Fund OS and Partners OS is PO Box 309 Ugland House, Grand Cayman, KY1-1104, Cayman Islands.

(c)       The principal business of each of BVF, BVF2, and Trading Fund OS is investing in securities. The principal business of BVF GP, BVF2 GP, and Partners OS is serving as the general partner of BVF, BVF2, and Trading Fund OS, respectively. The principal business of BVF GPH is serving as the sole member of each of BVF GP and BVF2 GP. The principal business of Partners is serving as the investment manager of each of BVF, BVF2, Trading Fund OS and the Partners Managed Accounts, and the sole member of Partners OS. The principal business of BVF Inc. is serving as the general partner of Partners and the managing member of BVF GPH. Mr. Lampert is the sole officer and director of BVF Inc. Mr. Perry is the President of Partners.

(d)       No Reporting Person has, during the last five years, been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors).

(e)       No Reporting Person has, during the last five years, been party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

(f)       Messrs. Lampert and Perry are citizens of the United States of America.

Item 4. Purpose of Transaction.

Item 4 is hereby amended to add the following:

On January 31, 2020, the Issuer entered into an Investment Agreement (the “Investment Agreement”) by and among certain existing stockholders of the Issuer, including Partners (collectively, the “Investors”). Pursuant to the Investment Agreement, the Investors have agreed to, severally and not jointly, purchase shares of the Common Stock, and/or series X convertible preferred stock, par value $0.001(“Series X Preferred”), having an aggregate value equal to the value of all shares of Common Stock and/or Series X Preferred (if any) offered but not purchased pursuant to the exercise of rights in the Issuer’s rights offering, including any exercise of rights by the Investors, up to a total value of $60,000,000. The Investment Agreement contains customary representations, warranties and covenants by the parties.

The above description of the Investment Agreement does not purport to be complete and is qualified in its entirety by reference to the Investment Agreement filed as Exhibit 10.1 to the Issuer’s Current Report on Form 8-K filed with the Securities and Exchange Commission (the “SEC”) on February 3, 2020, which is incorporated by reference herein.

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CUSIP No. 12648L601

Item 5. Interest in Securities of the Issuer.

Items 5(a) – (c) are hereby amended and restated to read as follows:

(a)       The aggregate percentage of shares of Common Stock reported owned by each person named herein is based on a denominator that is the sum of: (i) 57,978,725 shares of Common Stock outstanding, as of October 24, 2019, as disclosed in the Issuer’s Quarterly Report on Form 10-Q filed with the SEC on November 4, 2019, and (ii) certain or all of the 5,824,000 shares of Common Stock that would be issued upon the conversion of certain shares of Series O Preferred Stock.

As of the date hereof, the Reporting Persons hold 12,575 shares of Series O Preferred Stock, convertible into an aggregate of 8,383,333 shares of Common Stock. The conversion ratio is 667 shares of Common Stock for 1 share of Series O Preferred Stock. The Series O Preferred Stock may not be converted if, after such conversion, the Reporting Persons would beneficially own, as determined in accordance with Section 13(d) of the Securities Exchange Act of 1934, as amended, more than 19.99% of the shares of Common Stock outstanding immediately after giving effect to such conversion (the “Beneficial Ownership Limitation”). The Reporting Persons, in the aggregate, will reach the Beneficial Ownership Limitation, upon the conversion of 8,736 shares of Series O Preferred Stock representing 5,824,000 shares of Common Stock. As such, 3,839 shares of Series O Preferred Stock representing 2,559,333 shares of Common Stock are blocked from being converted pursuant to the Beneficial Ownership Limitation.

As of the date hereof, (i) BVF beneficially owned 6,795,120 shares of Common Stock, including approximately 3,754,000 shares of Common Stock issuable upon the conversion of 5,631 shares of Series O Preferred Stock, representing percentage ownership of approximately 11.0% of the shares of Common Stock outstanding, (ii) BVF2 beneficially owned 4,179,280 shares of Common Stock, including approximately 2,070,000 shares of Common Stock issuable upon the conversion of 3,105 shares of Series O Preferred Stock and excluding approximately 356,667 shares of Common Stock issuable upon the conversion of 535 shares of Series O Preferred Stock, representing percentage ownership of approximately 7.0% of the shares of Common Stock outstanding, (iii) Trading Fund OS beneficially owned 483,708 shares of Common Stock, excluding approximately 682,666 shares of Common Stock issuable upon the conversion of 1,024 shares of Series O Preferred Stock, representing percentage ownership of less than 1% of the shares of Common Stock outstanding and (iv) 1,295,582 shares of Common Stock were held in the Partners Managed Accounts, excluding approximately 1,520,000 shares of Common Stock issuable upon the conversion of 2,280 shares Series O Preferred Stock, representing percentage ownership of approximately 2.2% of the shares of Common Stock outstanding.

BVF GP, as the general partner of BVF, may be deemed to beneficially own the 6,795,120 shares of Common Stock beneficially owned by BVF, representing percentage ownership of approximately 11.0% of the shares of Common Stock outstanding.

BVF2 GP, as the general partner of BVF2, may be deemed to beneficially own the 4,179,280 shares of Common Stock beneficially owned by BVF2, representing percentage ownership of approximately 7.0% of the shares of Common Stock outstanding.

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CUSIP No. 12648L601

Partners OS, as the general partner of Trading Fund OS, may be deemed to beneficially own the 483,708 shares of Common Stock beneficially owned by Trading Fund OS, representing percentage ownership of less than 1% of the shares of Common Stock outstanding.

BVF GPH, as the sole member of each of BVF GP and BVF2 GP, may be deemed to beneficially own the 10,974,400 shares of Common Stock beneficially owned in the aggregate by BVF and BVF2, representing percentage ownership of approximately 17.2% of the shares of Common Stock outstanding.

Partners, as the investment manager of BVF, BVF2, Trading Fund OS and the Partners Managed Accounts and the sole member of Partners OS, may be deemed to beneficially own the 12,753,690 Shares of Common Stock beneficially owned in the aggregate by BVF, BVF2, Trading Fund OS, and held in the Partners Managed Accounts, representing percentage ownership of approximately 19.99% of the shares of Common Stock outstanding.

BVF Inc., as the general partner of Partners, may be deemed to beneficially own the 12,753,690 Shares beneficially owned by Partners, representing percentage ownership of approximately 19.99% of the Shares outstanding.

Mr. Lampert, as a director and officer of BVF Inc. may be deemed to beneficially own the 12,753,690 Shares beneficially owned by BVF Inc., representing percentage ownership of approximately 19.99% of the shares of Common Stock outstanding.

As of the date hereof, Mr. Perry directly owns 153,139 shares of Common Stock, including 110,000 shares of Common Stock issuable on the exercise of certain options that are currently exercisable, representing percentage ownership of less than 1% of the shares of Common Stock outstanding.

(b)       Each of BVF, BVF2 and Trading Fund OS shares with Partners voting and dispositive power over the shares of Common Stock each such entity beneficially owns. BVF shares with BVF GP voting and dispositive power over the shares of Common Stock beneficially owned by BVF. BVF2 shares with BVF2 GP voting and dispositive power over the shares of Common Stock beneficially owned by BVF2. Each of BVF GP and BVF2 GP shares with BVF GPH voting and dispositive power over the shares of Common Stock each such entity beneficially owns. Trading Fund OS shares with Partners OS voting and dispositive power over the shares of Common Stock beneficially owned by Trading Fund OS. Partners, BVF Inc. and Mr. Lampert share voting and dispositive power over the 12,753,690 shares of Common Stock they may be deemed to beneficially own with BVF, BVF GP, BVF2, BVF2 GP, Trading Fund OS, Partners OS, BVF GPH and the Partners Managed Accounts.

(c)       The Reporting Persons have not entered into any transactions in the securities of the Issuer during the past sixty days.

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CUSIP No. 12648L601

Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.

Item 6 is hereby amended to add the following:

As described in Item 4 above, certain of the Reporting Persons and the Issuer entered into the Investment Agreement, a copy of which is filed as Exhibit 10.1 to the Issuer’s Form 8-K filed with the SEC on February 3, 2020.

On February 4, 2020, the Reporting Persons entered into a Joint Filing Agreement in which the Reporting Persons agreed to the joint filing on behalf of each of them of statements on Schedule 13D, with respect to securities of the Issuer, to the extent required by applicable law. A copy of this agreement is attached hereto as Exhibit 99.2 and is incorporated herein by reference.

Item 7. Material to be Filed as Exhibits.

Item 7 is hereby amended to add the following exhibits:

99.1 Investment Agreement, dated January 31, 2020 (incorporated by reference to Exhibit 10.1 to the Issuer’s Current Report on Form 8-K filed with the SEC on February 3, 2020).
99.2 Joint Filing Agreement by and among Biotechnology Value Fund, L.P., BVF I GP LLC, Biotechnology Value Fund II, L.P., BVF II GP, LLC, Biotechnology Value Trading Fund OS LP, BVF Partners OS Ltd., BVF GP Holdings LLC, BVF Partners L.P., BVF Inc., Mark N. Lampert, and Matthew D. Perry, dated February 4, 2020.

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CUSIP No. 12648L601

SIGNATURES

After reasonable inquiry and to the best of his knowledge and belief, each of the undersigned certifies that the information set forth in this statement is true, complete and correct.

Dated: February 4, 2020 

BIOTECHNOLOGY VALUE FUND, L.P.   Biotechnology Value Trading Fund OS LP
     
By: BVF I GP LLC., its general partner      
      By: BVF Partners L.P., its investment manager
By: /s/ Mark N. Lampert   By: BVF Inc., its general partner
  Mark N. Lampert      
  Chief Executive Officer   By: /s/ Mark N. Lampert
        Mark N. Lampert
        President
BVF I GP LLC      
         
By: /s/ Mark N. Lampert   BVF GP HOLDINGS LLC
  Mark N. Lampert      
  Chief Executive Officer   By: /s/ Mark N. Lampert
        Mark N. Lampert
        Chief Executive Officer
BIOTECHNOLOGY VALUE FUND II, L.P.    
         
By: BVF II GP LLC its general partner   BVF PARTNERS L.P.
         
By: /s/ Mark N. Lampert   By: BVF Inc., its general partner
  Mark N. Lampert      
  Chief Executive Officer   By: /s/ Mark N. Lampert
        Mark N. Lampert
        President
BVF II GP LLC      
         
By: /s/ Mark N. Lampert   BVF INC.
  Mark N. Lampert      
  Chief Executive Officer   By: /s/ Mark N. Lampert
        Mark N. Lampert
        President
BVF PARTNERS OS LTD.      
         
By: BVF Partners L.P., its sole member   /s/ Mark N. Lampert
By: BVF Inc., its general partner   MARK N. LAMPERT
         
By: /s/ Mark N. Lampert      
  Mark N. Lampert   /s/ Matthew D. Perry
  President   MATTHEW D. PERRY

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